The Maine State Police Bomb Squad detonated unidentified material Thomas said was found in Upp's unit.

The court affidavit says TATP, triacetone triperoxide, was seized from the home

The affidavit also says the chemical is extremely sensitive when exposed to shock, friction or heat.

Amanda Bechard, Upp's girlfriend, says they only set off fireworks in the backyard, but investigators say they seized something they believe to be an actual explosive that in no way resembles any type of firework.

His next court appearance is set for July 24.

Upp's live-in girlfriend, Amanda Bechard, tells the Kennebec Journal that the materials seized were purchased at a fireworks store.